Opened 3 years ago
#20609 new defect
Poor performance on 4k display with scale factor less than 200%
| Reported by: | VB_User | Owned by: | |
|---|---|---|---|
| Component: | other | Version: | VirtualBox 6.1.26 |
| Keywords: | Cc: | ||
| Guest type: | Windows | Host type: | Windows |
Description
I'm experiencing problems with VirtualBox 6.1.26 (tried other versions as well, very end of 5 series, and end of 6.0) and 4k external display. My laptop is Lenovo P53 with i7-9850H and Nvidia T2000 graphics card. 4k display needs scaling and when it's set 200% (effective resolution Full HD) then everything is smooth. If I go lower than 200% the screen gets choppy - even when dragging the explorer window very slow refresh rate is noticeable. When I change to 100% for the scale factor everything is very smooth again. My goal is to use 150% scaling and that will give me QHD resolution - but it's impossible to use due to lag.
I tried all possible options. Adding more CPUs or enabling 3D acceleration doesn't make any difference. Changing the scale factor from 200% to 199% like with flick of switch affects performance.
I can't believe that this powerful laptop can't handle a 4k display with scaling. Something is not right here.
Host: Windows 10 Guest: Windows 7
